The Apache Tomcat Native library which allows using OpenSSL was not found on the java.library.path 問題解決記錄

1.問題

啟動Tomcat之后，在瀏覽器輸入IP后顯示503，查看catalina.log發現報錯：

2.問題定位：缺少 tomcat-native library

就是說 缺少Tomcat Native librayr的支持， 因此需要安裝 Tomcat Native library。
安裝參考 Tomcat-APR/tomcat-native-1.2.23-src源碼安裝和配置 和 The Apache Tomcat Native library which allows using OpenSSL was not found on the java.library.path
當然二者都是參考官網 來安裝 tomcat-native庫：

3.安裝tomcat-native 步驟

安裝環境：

• Linux版本：CentOS Linux release 7.9.2009
• apache-tomcat-9.0.41
• openjdk version "1.8.0_292"

3.1 確認gcc、apr、apr-devel、apr-util 以及 JDK是否已經安裝過，沒有就需要安裝

# 1.確認 gcc, 若已安裝就會顯示安裝的版本
rpm -qa gcc
# gcc-4.8.5-28.el7_5.1.x86_64
#沒有就安裝

yum install gcc
# 2.確認 apr, 沒有就 yum install gcc
rpm -qa apr
# 3.確認 apr-devel，沒有就 yum install apr-devel
rpm -qa apr-devel
# 4.確認 apr-util， 沒有就 yum install apr-util
rpm -qa apr-util
# 5. 確認 JDK，沒有就 yum install -y java-1.8.0-openjdk
which java 
java -version

3.2. 源碼安裝tomcat-native-1.2.23

下載地址：官網

下載到 /opt 目錄下，tar zxvf tomcat-native-1.2.23-src.tar.gz 解壓 ，進入 tomcat-native-1.2.23-src/native ，然后參考官方給的模板執行：

./configure --with-apr=/usr/bin/apr-1-config \
            --with-java-home=/home/jfclere/JAVA/jdk1.7.0_80/ \
            --with-ssl=yes \
            --prefix=$CATALINA_HOME

• --with-java-home：jdk的安裝目錄，筆者是 yum install -y java-1.8.0-openjdk 安裝的，因此是 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-1.el7_9.x86_64 ；
• --prefix：Tomcat安裝目錄

## 筆者的命令
./configure --with-apr=/usr/bin/apr-1-config \
            --with-java-home=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-1.el7_9.x86_64 \
            --with-ssl=yes \
            --prefix=/usr/local/apache-tomcat-9.0.41

然后 編譯安裝 make && make install 成功后會看到如下的內容：

Libraries have been installed in:
   /usr/local/apache-tomcat-9.0.41/lib
   
If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,-rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'

即庫已經安裝到之前 --prefix指定目錄下的 lib子目錄中，同時還需要以下操作：

修改 /usr/local/apache-tomcat-9.0.41/bin/catalina.sh ，在 文件末尾添加

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/apache-tomcat-9.0.41/lib
export LD_LIBRARY_PATH

再在 /usr/local/apache-tomcat-9.0.41/conf/server.xml 配置 Tomcat Connector，將 protocol修改成如下內容：

<Connector port="80" protocol="org.apache.coyote.http11.Http11NioProtocol"
               connectionTimeout="20000"
               redirectPort="8443" />

重啟Tomcat服務器 問題就解決了